Chai, Xiaoyun
Liu, Ying
Mao, Zhuxin http://orcid.org/0000-0002-7444-1584
Li, Shunping http://orcid.org/0000-0001-8144-6220
Article History
Received: 8 December 2020
Accepted: 24 February 2021
First Online: 8 March 2021
Declarations
:
: The study was conducted in accordance with the ethical guidelines set forth by the Declaration of Helsinki. The study was approved by the Medical Ethics Committee of School of Health Care Management, Shandong University (ECSHCMSDU20181103). Written informed consent was obtained from all participants. For one participant under the age of 16, only his parents were interviewed and their written and verbal informed consent was obtained.
: Not applicable.
: The authors declare no conflict of interest.